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Transcription and Regulation

Transcription and Regulation
Transcription factors are

proteins which bind to DNA and regulate transcription
promoters
CATT boxes
TATA boxes

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Transcription and Regulation
The closed complex at bacterial promoters is

not affected by promoter mutations
bound more tightly when repressors are present
not affected by activator proteins
in equilibrium with free RNA polymerase and the promoter

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Transcription and Regulation
Enhancers are regions that

are CAT box binding proteins
bind RNA polymerase
modulate transcription
are adjacent to the TATA box

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Transcription and Regulation
Transcription results in

messenger RNA
an amino acid chain
Okazaki fragments
complementary DNA

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Transcription and Regulation
Transcription of each set of rRNA genes by RNA polymerasel produces

a single 18S rRNA precursor molecule
a single 45S rRNA precursor molecule
a single 28S rRNA precursor molecule
a single 5S rRNA precursor molecule

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Transcription and Regulation
In prokaryotes, transcription is

terminated by a start codon
terminated by the stop codon
terminated by a protein called rho
terminated by a poly A sequence

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